cesiumDemo/Source/Workers/createPolylineVolumeGeometry.js

/* This file is automatically rebuilt by the Cesium build process. */
define(['./defined-26bd4a03', './Check-da037458', './freezeObject-2d83f591', './defaultValue-f2e68450', './Math-fa6e45cb', './Cartesian2-2a723276', './defineProperties-6f7a50f2', './Transforms-65aba0a4', './RuntimeError-ad75c885', './WebGLConstants-497deb20', './ComponentDatatype-69643096', './GeometryAttribute-ed359d71', './when-ee12a2cb', './GeometryAttributes-eecc9f43', './AttributeCompression-87682214', './GeometryPipeline-f0b16df6', './EncodedCartesian3-8b2b90d0', './IndexDatatype-3de60176', './IntersectionTests-c2360ffa', './Plane-a1a3fd52', './VertexFormat-fbb91dc7', './arrayRemoveDuplicates-dd708d81', './BoundingRectangle-36e6acca', './EllipsoidTangentPlane-10c6053a', './EllipsoidRhumbLine-c6cdbfd3', './PolygonPipeline-e486c11c', './PolylineVolumeGeometryLibrary-57289189', './EllipsoidGeodesic-53e988a6', './PolylinePipeline-b4161aaf'], function (defined, Check, freezeObject, defaultValue, _Math, Cartesian2, defineProperties, Transforms, RuntimeError, WebGLConstants, ComponentDatatype, GeometryAttribute, when, GeometryAttributes, AttributeCompression, GeometryPipeline, EncodedCartesian3, IndexDatatype, IntersectionTests, Plane, VertexFormat, arrayRemoveDuplicates, BoundingRectangle, EllipsoidTangentPlane, EllipsoidRhumbLine, PolygonPipeline, PolylineVolumeGeometryLibrary, EllipsoidGeodesic, PolylinePipeline) { 'use strict';

    function computeAttributes(combinedPositions, shape, boundingRectangle, vertexFormat) {
            var attributes = new GeometryAttributes.GeometryAttributes();
            if (vertexFormat.position) {
                attributes.position = new GeometryAttribute.GeometryAttribute({
                    componentDatatype : ComponentDatatype.ComponentDatatype.DOUBLE,
                    componentsPerAttribute : 3,
                    values : combinedPositions
                });
            }
            var shapeLength = shape.length;
            var vertexCount = combinedPositions.length / 3;
            var length = (vertexCount - shapeLength * 2) / (shapeLength * 2);
            var firstEndIndices = PolygonPipeline.PolygonPipeline.triangulate(shape);

            var indicesCount = (length - 1) * (shapeLength) * 6 + firstEndIndices.length * 2;
            var indices = IndexDatatype.IndexDatatype.createTypedArray(vertexCount, indicesCount);
            var i, j;
            var ll, ul, ur, lr;
            var offset = shapeLength * 2;
            var index = 0;
            for (i = 0; i < length - 1; i++) {
                for (j = 0; j < shapeLength - 1; j++) {
                    ll = j * 2 + i * shapeLength * 2;
                    lr = ll + offset;
                    ul = ll + 1;
                    ur = ul + offset;

                    indices[index++] = ul;
                    indices[index++] = ll;
                    indices[index++] = ur;
                    indices[index++] = ur;
                    indices[index++] = ll;
                    indices[index++] = lr;
                }
                ll = shapeLength * 2 - 2 + i * shapeLength * 2;
                ul = ll + 1;
                ur = ul + offset;
                lr = ll + offset;

                indices[index++] = ul;
                indices[index++] = ll;
                indices[index++] = ur;
                indices[index++] = ur;
                indices[index++] = ll;
                indices[index++] = lr;
            }

            if (vertexFormat.st || vertexFormat.tangent || vertexFormat.bitangent) { // st required for tangent/bitangent calculation
                var st = new Float32Array(vertexCount * 2);
                var lengthSt = 1 / (length - 1);
                var heightSt = 1 / (boundingRectangle.height);
                var heightOffset = boundingRectangle.height / 2;
                var s, t;
                var stindex = 0;
                for (i = 0; i < length; i++) {
                    s = i * lengthSt;
                    t = heightSt * (shape[0].y + heightOffset);
                    st[stindex++] = s;
                    st[stindex++] = t;
                    for (j = 1; j < shapeLength; j++) {
                        t = heightSt * (shape[j].y + heightOffset);
                        st[stindex++] = s;
                        st[stindex++] = t;
                        st[stindex++] = s;
                        st[stindex++] = t;
                    }
                    t = heightSt * (shape[0].y + heightOffset);
                    st[stindex++] = s;
                    st[stindex++] = t;
                }
                for (j = 0; j < shapeLength; j++) {
                    s = 0;
                    t = heightSt * (shape[j].y + heightOffset);
                    st[stindex++] = s;
                    st[stindex++] = t;
                }
                for (j = 0; j < shapeLength; j++) {
                    s = (length - 1) * lengthSt;
                    t = heightSt * (shape[j].y + heightOffset);
                    st[stindex++] = s;
                    st[stindex++] = t;
                }

                attributes.st = new GeometryAttribute.GeometryAttribute({
                    componentDatatype : ComponentDatatype.ComponentDatatype.FLOAT,
                    componentsPerAttribute : 2,
                    values : new Float32Array(st)
                });
            }

            var endOffset = vertexCount - shapeLength * 2;
            for (i = 0; i < firstEndIndices.length; i += 3) {
                var v0 = firstEndIndices[i] + endOffset;
                var v1 = firstEndIndices[i + 1] + endOffset;
                var v2 = firstEndIndices[i + 2] + endOffset;

                indices[index++] = v0;
                indices[index++] = v1;
                indices[index++] = v2;
                indices[index++] = v2 + shapeLength;
                indices[index++] = v1 + shapeLength;
                indices[index++] = v0 + shapeLength;
            }

            var geometry = new GeometryAttribute.Geometry({
                attributes : attributes,
                indices : indices,
                boundingSphere : Transforms.BoundingSphere.fromVertices(combinedPositions),
                primitiveType : GeometryAttribute.PrimitiveType.TRIANGLES
            });

            if (vertexFormat.normal) {
                geometry = GeometryPipeline.GeometryPipeline.computeNormal(geometry);
            }

            if (vertexFormat.tangent || vertexFormat.bitangent) {
                try {
                    geometry = GeometryPipeline.GeometryPipeline.computeTangentAndBitangent(geometry);
                } catch (e) {
                    Transforms.oneTimeWarning('polyline-volume-tangent-bitangent', 'Unable to compute tangents and bitangents for polyline volume geometry');
                    //TODO https://github.com/AnalyticalGraphicsInc/cesium/issues/3609
                }

                if (!vertexFormat.tangent) {
                    geometry.attributes.tangent = undefined;
                }
                if (!vertexFormat.bitangent) {
                    geometry.attributes.bitangent = undefined;
                }
                if (!vertexFormat.st) {
                    geometry.attributes.st = undefined;
                }
            }

            return geometry;
        }

        /**
         * A description of a polyline with a volume (a 2D shape extruded along a polyline).
         *
         * @alias PolylineVolumeGeometry
         * @constructor
         *
         * @param {Object} options Object with the following properties:
         * @param {Cartesian3[]} options.polylinePositions An array of {@link Cartesain3} positions that define the center of the polyline volume.
         * @param {Cartesian2[]} options.shapePositions An array of {@link Cartesian2} positions that define the shape to be extruded along the polyline
         * @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid to be used as a reference.
         * @param {Number} [options.granularity=CesiumMath.RADIANS_PER_DEGREE] The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer.
         * @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
         * @param {CornerType} [options.cornerType=CornerType.ROUNDED] Determines the style of the corners.
         *
         * @see PolylineVolumeGeometry#createGeometry
         *
         * @demo {@link https://sandcastle.cesium.com/index.html?src=Polyline%20Volume.html|Cesium Sandcastle Polyline Volume Demo}
         *
         * @example
         * function computeCircle(radius) {
         *   var positions = [];
         *   for (var i = 0; i < 360; i++) {
         *     var radians = Cesium.Math.toRadians(i);
         *     positions.push(new Cesium.Cartesian2(radius * Math.cos(radians), radius * Math.sin(radians)));
         *   }
         *   return positions;
         * }
         *
         * var volume = new Cesium.PolylineVolumeGeometry({
         *   vertexFormat : Cesium.VertexFormat.POSITION_ONLY,
         *   polylinePositions : Cesium.Cartesian3.fromDegreesArray([
         *     -72.0, 40.0,
         *     -70.0, 35.0
         *   ]),
         *   shapePositions : computeCircle(100000.0)
         * });
         */
        function PolylineVolumeGeometry(options) {
            options = defaultValue.defaultValue(options, defaultValue.defaultValue.EMPTY_OBJECT);
            var positions = options.polylinePositions;
            var shape = options.shapePositions;

            //>>includeStart('debug', pragmas.debug);
            if (!defined.defined(positions)) {
                throw new Check.DeveloperError('options.polylinePositions is required.');
            }
            if (!defined.defined(shape)) {
                throw new Check.DeveloperError('options.shapePositions is required.');
            }
            //>>includeEnd('debug');

            this._positions = positions;
            this._shape = shape;
            this._ellipsoid = Cartesian2.Ellipsoid.clone(defaultValue.defaultValue(options.ellipsoid, Cartesian2.Ellipsoid.WGS84));
            this._cornerType = defaultValue.defaultValue(options.cornerType, PolylineVolumeGeometryLibrary.CornerType.ROUNDED);
            this._vertexFormat = VertexFormat.VertexFormat.clone(defaultValue.defaultValue(options.vertexFormat, VertexFormat.VertexFormat.DEFAULT));
            this._granularity = defaultValue.defaultValue(options.granularity, _Math.CesiumMath.RADIANS_PER_DEGREE);
            this._workerName = 'createPolylineVolumeGeometry';

            var numComponents = 1 + positions.length * Cartesian2.Cartesian3.packedLength;
            numComponents += 1 + shape.length * Cartesian2.Cartesian2.packedLength;

            /**
             * The number of elements used to pack the object into an array.
             * @type {Number}
             */
            this.packedLength = numComponents + Cartesian2.Ellipsoid.packedLength + VertexFormat.VertexFormat.packedLength + 2;
        }

        /**
         * Stores the provided instance into the provided array.
         *
         * @param {PolylineVolumeGeometry} value The value to pack.
         * @param {Number[]} array The array to pack into.
         * @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
         *
         * @returns {Number[]} The array that was packed into
         */
        PolylineVolumeGeometry.pack = function(value, array, startingIndex) {
            //>>includeStart('debug', pragmas.debug);
            if (!defined.defined(value)) {
                throw new Check.DeveloperError('value is required');
            }
            if (!defined.defined(array)) {
                throw new Check.DeveloperError('array is required');
            }
            //>>includeEnd('debug');

            startingIndex = defaultValue.defaultValue(startingIndex, 0);

            var i;

            var positions = value._positions;
            var length = positions.length;
            array[startingIndex++] = length;

            for (i = 0; i < length; ++i, startingIndex += Cartesian2.Cartesian3.packedLength) {
                Cartesian2.Cartesian3.pack(positions[i], array, startingIndex);
            }

            var shape = value._shape;
            length = shape.length;
            array[startingIndex++] = length;

            for (i = 0; i < length; ++i, startingIndex += Cartesian2.Cartesian2.packedLength) {
                Cartesian2.Cartesian2.pack(shape[i], array, startingIndex);
            }

            Cartesian2.Ellipsoid.pack(value._ellipsoid, array, startingIndex);
            startingIndex += Cartesian2.Ellipsoid.packedLength;

            VertexFormat.VertexFormat.pack(value._vertexFormat, array, startingIndex);
            startingIndex += VertexFormat.VertexFormat.packedLength;

            array[startingIndex++] = value._cornerType;
            array[startingIndex]   = value._granularity;

            return array;
        };

        var scratchEllipsoid = Cartesian2.Ellipsoid.clone(Cartesian2.Ellipsoid.UNIT_SPHERE);
        var scratchVertexFormat = new VertexFormat.VertexFormat();
        var scratchOptions = {
            polylinePositions : undefined,
            shapePositions : undefined,
            ellipsoid : scratchEllipsoid,
            vertexFormat : scratchVertexFormat,
            cornerType : undefined,
            granularity : undefined
        };

        /**
         * Retrieves an instance from a packed array.
         *
         * @param {Number[]} array The packed array.
         * @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
         * @param {PolylineVolumeGeometry} [result] The object into which to store the result.
         * @returns {PolylineVolumeGeometry} The modified result parameter or a new PolylineVolumeGeometry instance if one was not provided.
         */
        PolylineVolumeGeometry.unpack = function(array, startingIndex, result) {
            //>>includeStart('debug', pragmas.debug);
            if (!defined.defined(array)) {
                throw new Check.DeveloperError('array is required');
            }
            //>>includeEnd('debug');

            startingIndex = defaultValue.defaultValue(startingIndex, 0);

            var i;

            var length = array[startingIndex++];
            var positions = new Array(length);

            for (i = 0; i < length; ++i, startingIndex += Cartesian2.Cartesian3.packedLength) {
                positions[i] = Cartesian2.Cartesian3.unpack(array, startingIndex);
            }

            length = array[startingIndex++];
            var shape = new Array(length);

            for (i = 0; i < length; ++i, startingIndex += Cartesian2.Cartesian2.packedLength) {
                shape[i] = Cartesian2.Cartesian2.unpack(array, startingIndex);
            }

            var ellipsoid = Cartesian2.Ellipsoid.unpack(array, startingIndex, scratchEllipsoid);
            startingIndex += Cartesian2.Ellipsoid.packedLength;

            var vertexFormat = VertexFormat.VertexFormat.unpack(array, startingIndex, scratchVertexFormat);
            startingIndex += VertexFormat.VertexFormat.packedLength;

            var cornerType = array[startingIndex++];
            var granularity = array[startingIndex];

            if (!defined.defined(result)) {
                scratchOptions.polylinePositions = positions;
                scratchOptions.shapePositions = shape;
                scratchOptions.cornerType = cornerType;
                scratchOptions.granularity = granularity;
                return new PolylineVolumeGeometry(scratchOptions);
            }

            result._positions = positions;
            result._shape = shape;
            result._ellipsoid = Cartesian2.Ellipsoid.clone(ellipsoid, result._ellipsoid);
            result._vertexFormat = VertexFormat.VertexFormat.clone(vertexFormat, result._vertexFormat);
            result._cornerType = cornerType;
            result._granularity = granularity;

            return result;
        };

        var brScratch = new BoundingRectangle.BoundingRectangle();

        /**
         * Computes the geometric representation of a polyline with a volume, including its vertices, indices, and a bounding sphere.
         *
         * @param {PolylineVolumeGeometry} polylineVolumeGeometry A description of the polyline volume.
         * @returns {Geometry|undefined} The computed vertices and indices.
         */
        PolylineVolumeGeometry.createGeometry = function(polylineVolumeGeometry) {
            var positions = polylineVolumeGeometry._positions;
            var cleanPositions = arrayRemoveDuplicates.arrayRemoveDuplicates(positions, Cartesian2.Cartesian3.equalsEpsilon);
            var shape2D = polylineVolumeGeometry._shape;
            shape2D = PolylineVolumeGeometryLibrary.PolylineVolumeGeometryLibrary.removeDuplicatesFromShape(shape2D);

            if (cleanPositions.length < 2 || shape2D.length < 3) {
                return undefined;
            }

            if (PolygonPipeline.PolygonPipeline.computeWindingOrder2D(shape2D) === PolygonPipeline.WindingOrder.CLOCKWISE) {
                shape2D.reverse();
            }
            var boundingRectangle = BoundingRectangle.BoundingRectangle.fromPoints(shape2D, brScratch);

            var computedPositions = PolylineVolumeGeometryLibrary.PolylineVolumeGeometryLibrary.computePositions(cleanPositions, shape2D, boundingRectangle, polylineVolumeGeometry, true);
            return computeAttributes(computedPositions, shape2D, boundingRectangle, polylineVolumeGeometry._vertexFormat);
        };

    function createPolylineVolumeGeometry(polylineVolumeGeometry, offset) {
            if (defined.defined(offset)) {
                polylineVolumeGeometry = PolylineVolumeGeometry.unpack(polylineVolumeGeometry, offset);
            }
            polylineVolumeGeometry._ellipsoid = Cartesian2.Ellipsoid.clone(polylineVolumeGeometry._ellipsoid);
            return PolylineVolumeGeometry.createGeometry(polylineVolumeGeometry);
        }

    return createPolylineVolumeGeometry;

});